Barracks Row already has already added a fine dining restaurant, a martini bar, and an Irish pub new to its list of offerings on Eighth Street SE. And now comes Graig Glufling, former chef at Matchbox, bringing classic American comfort food to The Ugly Mug, his new bar on the Row. When DCist says new, we do mean new. The Ugly Mug opened on Dec. 30. Tom Sietsema remarked in his weekly chat that when…